Welcome, I have produced a script that generates and caches images for use in your signatures.
I had always planned to build a tool to allow you to create the code for these signatures, but meh.
Instead I am producing this documentation, mostly to make sure people actually use my tool correctly.
So without further adieu, here's how you make it work.

The most useful features are the Name, Tag and Group text fields. To use these, simply write out what you want in there,
and replace any spaces with '+', other special characters such as '&' might need to be replaced with their url encoded versions.URL Encoder-Decoder

Additionally you can chose the color of the text, by specifying the RGB components of the color. These are specified as integer from 0 (off) to 255 (full)
If any color is not specified it will use the default of: R=0, G=255, B=60, for that color.Color Picker

The background can be easily changed, simply add the 'bk' field, the default is always the background for the latest mission.
It should be noted that certain backgrounds are designed for left aligned text instead of right. Fixing this is as simply as adding the 'left' field.

You can force the server to use the cached version of your image, much like saving it to Imgur, it will load faster (hopefully) for new people. It also stops the server from regenerating (or generating) the image. So create the signature without the cache flag first.

Sorry everyone, someone unplugged my server without realizing it.
The signatures are down for now, I'll likely get them back up in the next few hours, but I'm too tired to go through the effort right this moment.

EDIT:: Everything should be running again, I'll need a temporary solution for the two weeks starting from the 15th.
As I will be living out of a suitcase for these two weeks before moving to my new house were I can implement a more permanent solution.

Increased regeneration timer to 24 hours, instead of 6.
Now images only regenerate once per day.

Added an experimental cache feature.
For those people who would rather not have their image reload every day.
This will ONLY pull the image from cache, which is much faster than regeneration.
If the image does not exist in the cache then the load will fail,
so be sure to actually try your image without the cache feature first, to ensure that it has been generated.

Modified load-from-disk of all cached images.
It should be faster to load images that are cached server-side and not cached locally now.
But I can't get accurate metrics on this unfortunately.